2 Answers
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Use Orfeo Toolbox > Image Manipulation > Split Image. This splits an n-band multiband image into n images. The output filename is a prefix and the channels (bands) are numbers accordingly e.g. if filename = 'myImage.tif' then the first band will be saved as 'myImage_0.tif' and the second 'myImage_1.tif' and so on. See here for a more detailed tutorial.